Turbine rotor



Nov. 4, 1947. I PRESCOTT 2,430,185

TURBINE ROTOR Filed July 25, 1946 ATTORNEY! Patented Nov. 4, 1947 UNETED STATES PATENT OFFlCE TURBINE ROTOR I Ford L. Prescott, Gainesville, Fla., assignor to Continental Aviation & Engineering Corporation, Detroit, Mich., a corporation of Virginia Application July 25, 1946, Serial No. 686,240

1 Claim. 1

This invention relates to turbine blades and to methods of manufacturing turbines, particularly to the method of securing turbine buckets to a rotor.

The velocity of rotation of turbine rotors is so high that blade tip velocities often reach the speed of sound. The centrifugal forces set up by such high rotational velocities present rather diificult designproblems, one of which is an effective and economical method for securing the turbine buckets or blades to the rotor.

It is the object of this invention to provide a strong and economical joint for securing turbine blades, or buckets, as theyare often called, to the rotor. The joint proposed by this invention is one that is easily and economically manufactured, and yet distributes the stresses so as to provide great strength.

In the drawings:

Fig. 1 is an end elevation view of a portion of method of mounting, and

Fig. 2 is a developed plan view of the periphery of the rotor.

The drawings show a portion of a turbine rotor 2 on which are mountedblades 4 according to the invention.

The invention is efl'ected by machining a plurality of V-slots 6 in the periphery of the rotor such that the slots diverge outwardly toward the periphery. Each blade 4 is provided with a haft 8 which is formed to fit into slot 6. At the surface of contact between haft 8 and rotor 2, there are drilled a number of holes Ill. The axis of each hole will preferably lie substantially'in the contact surface so that approximately half of each hole will be in the haft and half will be in the rotor itself. The holes may be formed with blade 4 and haft 8 held in place, or they may be formed before assembly. Wire pins or keys I! are then driven tightly into the holes to hold the haft securely in the V-notch.

notches, each haft and the support having a plurality of holes drilled in the contact surfaces such that approximately half of a hole is in the support and the other half in the haft, and a wire tightly driven into each hole to key the blades to the support, the wirebeing held in place solely by the friction of the driving fit. the turbine rotor showing the blade and its FORD L. PRESCOTT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

